Did you install the WiFi card after you installed the VPN client?

The VPN client will bind to any present network adapters during
installation.  If you install a network adapter post-install, the
binding does not take place.  The VPN client will appear to be
connecting, but isn't able to complete and you get the message about
"isakmp" and then it disconnects.

Suggestion:  Reinstall the VPN client with the wireless adapter
present.

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